*Repelling [[Dementor]]s<ref name="COMSENS">As this was the set textbook and Snape taught those subjects, it is likely this book provided details on them. Also, "the faceless" could apply to Dementors as they wear hoods that cover their faces.</ref>

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*Repelling [[Dementor]]s<ref name="COMSENS">As this was the set textbook and Snape taught those subjects, it is likely this book provided details on them.</ref>